【Superior Music Quality】-Adopting most advanced Bluetooth 5.0, bring you unparalleled quality sound to enjoy-Two precision acoustic drivers provide pure/high quality sound for compatible devices. Built in HD microphone makes conversations sound clearly even in loud environment.

【Automatic Connection 】-The Wireless Bluetooth Earbuds are equipped with one-step pairing technology. ONLY pull the Left and the Right earbuds out of charging box and they will pair with each other, then "X21 " automatically appear on your smartphone. In a matter of seconds, you are in your euphonic music world. In addition, you can also choose that each headphones can connect two mobile phones at the same time.

【36H Powerful Battery Life】-Built-in high performance rechargeable lithium battery, high capacity battery provides up to 9 hours call time and 7hr music playtime, full charge in around 1 hours.And the 400 mAh large capacity charging case can be charged 4 times for 2pcs earbuds.wireless earbuds bring extended playtime and enjoyment.

【IPX7 WATERPROOF】-The Bluetooth earbuds has designed and provided favorable waterproof effect which can easily resist sweat and water. It's absolutely ideal and prefect for gym, sport lovers and all kind of outdoor activities. Note: we don't suggest you take the earbuds to shower as it doesn't resist the water and shampoo.

【Warranty】-Each TEZER wireless bluetooth earbud, We offer 60-day refund without giving a reason and 3-month warranty. If you have any questions, please contact us without any hesitation , we will try our best to solve your problem.